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引用第0楼crystal22于2009-04-09 09:03发表的 关于音量测试 :
6 I0 M" x6 L* O6 D! I急求:用B&K2238的音量计,请问EN71中的L[sub]PA[/sub]相当于2238中的哪个值?L[sub]PA1S[/sub]又相当于2238中的哪个值?MATTEL QSOP3600中的SEL相当于2238中的哪个值?
) j X1 _8 v) P5 Z3 ` PL[sub]PA[/sub]应该是指LAeq,连续发声
; q3 g9 E9 z: h v, i. Q9 d% `L[sub]PA1S[/sub]参考如下:) c- G6 ^* G7 H% g9 c! C5 O5 j% R) Y
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Measure the A-weighted single-event emission sound pressure level, LpA,1s, and the C-weighted peak emission sound pressure level, LpC peak for ten movements (squeezes, beats). Carry out the test three times.
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As an alternative to SEL, LAeq can be measured and the total measurement time t registered. The single-event emission sound pressure level can then be calculated from SEL = LAeq + 10 lg(t).
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For rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.
+ p- C- D9 S6 a' YSubtract 10 dB from the LpA1s to get the value for one.2 Y! B9 D4 c; s9 r, s" @
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对EN的摇铃和挤压发声玩具的单次LpA1s% E+ ~# a; ?2 E" U1 V* ~
有两种途径可以算出:
. H3 _/ v; O- m1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。# {8 [' v& [6 `$ b/ _# w
2、测量LAE(即SEL),再减去10。+ T% y: D4 C/ V( t# L
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楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+10
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" S) r, S5 l! O& u仪器参数可以去看说明书,里面都有说的
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1 t% `1 G" H G4 y2 s若有错误请前辈们指出,谢谢 |
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